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1770543 
Journal Article 
High-temperature ultrasonic fatigue testing of single-crystal superalloys 
Furuya, Y; Kobayashi, K; Hayakawa, M; Sakamoto, M; Koizumi, Y; Harada, H 
2012 
1 
Materials Letters
ISSN: 0167-577X
EISSN: 1873-4979 
69 
1-3 
WOS:000300190300001 
A high-temperature ultrasonic fatigue testing system was developed to evaluate the gigacycle fatigue properties of single-crystal superalloys used in aircraft engine turbine blades. In this development, a commercial ultrasonic fatigue testing machine was considerably modified to achieve high-temperature fatigue testing. The testing system was first applied to a heat-resistant steel at 650 degrees C to check its accuracy, and next to SC superalloy samples at 1000 degrees C. As a result, the ultrasonic fatigue testing showed good agreement with the conventional fatigue testing, demonstrating the high accuracy of the developed system. In these results. the SC superalloys showed no fatigue limit, indicating gigacycle fatigue tests to be necessary. (C) 2011 Elsevier B.V. All rights reserved. 
Fatigue; Metals and alloys; Structural; Ultrasonic fatigue testing; High-temperature